arm: socfpga: board: Align checkboard() output

Cosmetic change to the checkboard() function output. Align the
output with the rest of initial output produced by U-Boot.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Pavel Machek <pavel@denx.de>
Acked-by: Pavel Machek <pavel@denx.de>

board/altera/socfpga/socfpga_cyclone5.c

@@ -17,7 +17,7 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 int checkboard(void)
 {
-	puts("BOARD : Altera SOCFPGA Cyclone5 Board\n");
+	puts("BOARD: Altera SoCFPGA Cyclone5 Board\n");
 	return 0;
 }